[PULL][Xenial SRU] Mount updates for snaps in lxd containers

[Seth Forshee]

BugLink: http://bugs.launchpad.net/bugs/1634964

Resending this series. It had been applied previously but had to be
reverted due to including an upstream commit which caused a regression
in lxd. A new lxd has been released in xenial which contains a fix for
the regression, so we can now reapply these patches.

Original pull request:

 https://lists.ubuntu.com/archives/kernel-team/2016-October/080606.html

Thanks,
Seth

The following changes since commit 465797c39771cd0d3ac34a6d48d415ad7f12343c:

  UBUNTU: Ubuntu-4.4.0-55.76 (2016-12-08 14:35:14 +0000)

are available in the git repository at:

  git://git.launchpad.net/~sforshee/+git/ubuntu-xenial lp1634964

for you to fetch changes up to 565b99a1f1112d7f631b9e4697aa5fc3b5ddbcda:

  UBUNTU: SAUCE: (namespace) fuse: Allow user namespace mounts by default (2016-12-09 14:03:40 -0600)

----------------------------------------------------------------
Eric W. Biederman (8):
      (namespace) mnt: Move the FS_USERNS_MOUNT check into sget_userns
      (namespace) vfs: Verify acls are valid within superblock's s_user_ns.
      (namespace) vfs: Don't modify inodes with a uid or gid unknown to the vfs
      (namespace) vfs: Don't create inodes with a uid or gid unknown to the vfs
      (namespace) quota: Ensure qids map to the filesystem
      (namespace) quota: Handle quota data stored in s_user_ns in quota_setxquota
      (namespace) dquot: For now explicitly don't support filesystems outside of init_user_ns
      UBUNTU: SAUCE: (namespace) fs: Allow superblock owner to change ownership of inodes

Seth Forshee (13):
      (namespace) Revert "UBUNTU: SAUCE: fs: Refuse uid/gid changes which don't map into s_user_ns"
      (namespace) fs: Refuse uid/gid changes which don't map into s_user_ns
      (namespace) Revert "UBUNTU: SAUCE: fs: Update posix_acl support to handle user namespace mounts"
      UBUNTU: SAUCE: (namespace) posix_acl: Export posix_acl_fix_xattr_userns() to modules
      UBUNTU: SAUCE: (namespace) fuse: Translate ids in posix acl xattrs
      (namespace) Revert "UBUNTU: SAUCE: quota: Require that qids passed to dqget() be valid and map into s_user_ns"
      (namespace) Revert "UBUNTU: SAUCE: quota: Convert ids relative to s_user_ns"
      (namespace) Revert "UBUNTU: SAUCE: ima/evm: Allow root in s_user_ns to set xattrs"
      UBUNTU: SAUCE: (namespace) security/integrity: Harden against malformed xattrs
      (namespace) Revert "UBUNTU: SAUCE: fs: Allow superblock owner to change ownership of inodes with unmappable ids"
      (namespace) Revert "UBUNTU: SAUCE: fs: Don't remove suid for CAP_FSETID in s_user_ns"
      UBUNTU: SAUCE: (namespace) fs: Don't remove suid for CAP_FSETID for userns root
      UBUNTU: SAUCE: (namespace) fuse: Allow user namespace mounts by default

 drivers/staging/lustre/lustre/mdc/mdc_request.c |  2 +-
 fs/9p/acl.c                                     |  2 +-
 fs/attr.c                                       | 51 +++++++++----------
 fs/fuse/dir.c                                   | 30 +++++++++--
 fs/fuse/inode.c                                 |  2 +-
 fs/inode.c                                      | 12 ++++-
 fs/kernfs/inode.c                               |  2 -
 fs/namei.c                                      | 36 +++++++++++---
 fs/namespace.c                                  |  4 --
 fs/ocfs2/quota_global.c                         |  6 +--
 fs/posix_acl.c                                  | 61 ++++++++++-------------
 fs/proc/base.c                                  |  7 ++-
 fs/proc/generic.c                               |  6 ++-
 fs/proc/proc_sysctl.c                           |  7 ++-
 fs/quota/dquot.c                                | 12 +++--
 fs/quota/quota.c                                | 10 ++--
 fs/quota/quota_tree.c                           | 66 +++++++++----------------
 fs/quota/quota_v1.c                             | 13 +----
 fs/quota/quota_v2.c                             | 43 ++++++----------
 fs/super.c                                      |  4 ++
 fs/xattr.c                                      | 26 +++++-----
 include/linux/dqblk_qtree.h                     |  4 +-
 include/linux/fs.h                              |  5 ++
 include/linux/posix_acl.h                       |  2 +-
 include/linux/posix_acl_xattr.h                 | 24 ++++-----
 include/linux/quota.h                           | 10 ++++
 security/integrity/digsig.c                     |  2 +-
 security/integrity/evm/evm_main.c               |  6 ++-
 security/integrity/ima/ima_appraise.c           |  4 +-
 zfs/module/zfs/zpl_xattr.c                      |  4 +-
 30 files changed, 245 insertions(+), 218 deletions(-)